diff --git a/src/main/java/com/google/cloud/agentplatform/types/ReasoningEngineSpec.java b/src/main/java/com/google/cloud/agentplatform/types/ReasoningEngineSpec.java
index d1ea817..43eca94 100644
--- a/src/main/java/com/google/cloud/agentplatform/types/ReasoningEngineSpec.java
+++ b/src/main/java/com/google/cloud/agentplatform/types/ReasoningEngineSpec.java
@@ -99,6 +99,10 @@ public abstract class ReasoningEngineSpec extends JsonSerializable {
   @JsonProperty("containerSpec")
   public abstract Optional<ReasoningEngineSpecContainerSpec> containerSpec();
 
+  /** Optional. Configuration for building container image. */
+  @JsonProperty("buildSpec")
+  public abstract Optional<ReasoningEngineSpecBuildSpec> buildSpec();
+
   /** Instantiates a builder for ReasoningEngineSpec. */
   @ExcludeFromGeneratedCoverageReport
   public static Builder builder() {
@@ -394,6 +398,34 @@ public Builder clearContainerSpec() {
       return containerSpec(Optional.empty());
     }
 
+    /**
+     * Setter for buildSpec.
+     *
+     * <p>buildSpec: Optional. Configuration for building container image.
+     */
+    @JsonProperty("buildSpec")
+    public abstract Builder buildSpec(ReasoningEngineSpecBuildSpec buildSpec);
+
+    /**
+     * Setter for buildSpec builder.
+     *
+     * <p>buildSpec: Optional. Configuration for building container image.
+     */
+    @CanIgnoreReturnValue
+    public Builder buildSpec(ReasoningEngineSpecBuildSpec.Builder buildSpecBuilder) {
+      return buildSpec(buildSpecBuilder.build());
+    }
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder buildSpec(Optional<ReasoningEngineSpecBuildSpec> buildSpec);
+
+    /** Clears the value of buildSpec field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearBuildSpec() {
+      return buildSpec(Optional.empty());
+    }
+
     public abstract ReasoningEngineSpec build();
   }
 
diff --git a/src/main/java/com/google/cloud/agentplatform/types/ReasoningEngineSpecBuildSpec.java b/src/main/java/com/google/cloud/agentplatform/types/ReasoningEngineSpecBuildSpec.java
new file mode 100644
index 0000000..045574e
--- /dev/null
+++ b/src/main/java/com/google/cloud/agentplatform/types/ReasoningEngineSpecBuildSpec.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Auto-generated code. Do not edit.
+
+package com.google.cloud.agentplatform.types;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.google.auto.value.AutoValue;
+import com.google.errorprone.annotations.CanIgnoreReturnValue;
+import com.google.genai.JsonSerializable;
+import java.util.Optional;
+
+/** Specification for building container image. */
+@AutoValue
+@JsonDeserialize(builder = ReasoningEngineSpecBuildSpec.Builder.class)
+public abstract class ReasoningEngineSpecBuildSpec extends JsonSerializable {
+  /**
+   * Optional. Identifier. The resource name of the Cloud Build WorkerPool to use for the build.
+   * Format: `projects/{project}/locations/{location}/workerPools/{worker_pool}`
+   */
+  @JsonProperty("workerPool")
+  public abstract Optional<String> workerPool();
+
+  /** Instantiates a builder for ReasoningEngineSpecBuildSpec. */
+  @ExcludeFromGeneratedCoverageReport
+  public static Builder builder() {
+    return new AutoValue_ReasoningEngineSpecBuildSpec.Builder();
+  }
+
+  /** Creates a builder with the same values as this instance. */
+  public abstract Builder toBuilder();
+
+  /** Builder for ReasoningEngineSpecBuildSpec. */
+  @AutoValue.Builder
+  public abstract static class Builder {
+    /**
+     * For internal usage. Please use `ReasoningEngineSpecBuildSpec.builder()` for instantiation.
+     */
+    @JsonCreator
+    private static Builder create() {
+      return new AutoValue_ReasoningEngineSpecBuildSpec.Builder();
+    }
+
+    /**
+     * Setter for workerPool.
+     *
+     * <p>workerPool: Optional. Identifier. The resource name of the Cloud Build WorkerPool to use
+     * for the build. Format: `projects/{project}/locations/{location}/workerPools/{worker_pool}`
+     */
+    @JsonProperty("workerPool")
+    public abstract Builder workerPool(String workerPool);
+
+    @ExcludeFromGeneratedCoverageReport
+    abstract Builder workerPool(Optional<String> workerPool);
+
+    /** Clears the value of workerPool field. */
+    @ExcludeFromGeneratedCoverageReport
+    @CanIgnoreReturnValue
+    public Builder clearWorkerPool() {
+      return workerPool(Optional.empty());
+    }
+
+    public abstract ReasoningEngineSpecBuildSpec build();
+  }
+
+  /** Deserializes a JSON string to a ReasoningEngineSpecBuildSpec object. */
+  @ExcludeFromGeneratedCoverageReport
+  public static ReasoningEngineSpecBuildSpec fromJson(String jsonString) {
+    return JsonSerializable.fromJsonString(jsonString, ReasoningEngineSpecBuildSpec.class);
+  }
+}